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As the embodiment of all that is great and good about Silicon Valley, Marc Andreessen is surprisingly unassuming. He is the earnest, clean-cut Midwestern boy made good, the state school grad who built a better mousetrap—the Web browser—and saw the world beat a path to his door. If being on the cover of Time magazine at age 24 ever went to his head, he didn’t show it. Andreessen simply did what great entrepreneurs are supposed to do: start new companies, again and again. His subsequent ventures never achieved the notoriety of his first, Netscape Communications, but they put to rest any suspicions that his early triumph was a fluke.